Double-walled carton



Dec. 2, 1952 L, J MCDQNOUGH 2,620,116

DOUBLE-WALLED CARTON Filed March 8, 1950 #58 32 F] G. 4, INVENTOR.

ILINUS J MDONOUGH Patented Dec. 2, 1952 DOUBLE-WALLED CARTON Linus J.McDonough, Lockport, N.

Y., assignor to Corson Manufacturing Company, Lockport,

N. Y., a corporation Application March 8, 1950, Serial No. 148,295

2 Claims.

This invention relates generally to folding boxes or cartons and moreparticularly to cartons of the double-walled type adapted for protectionof the contents.

Inthe past, various forms of double-walled cartons have been developedof light-weight materials to provide inexpensive containers foreconomical shipment, storage and display of fragile merchandise. And asthe need for such containers has increased, so has the need increasedfor simplicity of construction and speed in manufacturing.

The present invention provides an improved, double-walled containercomprising a single sheet of material which, when folded, produces asmaller box held firmly in spaced relationship inside a larger box. Muchthe same result is gained by this simple, single-sheet box as is foundin the complex standard box with a corrugated sleeve or liner.

A distinct contribution to the basic problem here is found in U. S.Patent No. 975,121 issued November 8, 1910 to James H. Carter. Carterhas developed a double-walled box by folding a single sheet of flexiblematerial into a series of parallel sections with a suitable adhesiveapplied longitudinally along the marginal area of one of theintermediate sections. The box as fully described hereinafter, however,embodies a further improved product more easily adapted to simple andhigh speed production methods.

A primary object of this invention is to provide a single-sheet,double-walled carton comprising two spaced boxes, one within the other,formed in a single operation with a minimum of folding and gluing bystandard production machines.

Still another object is to produce the desired container wherein theinner and outer boxes are integrally joined and interlocked forpractical rigidity.

A further object of the invention is to provide a double-walled boxhaving sufiicient bottom or end reinforcement without complex folds.

Anadditional object of this container lies in the simple constructionwhereby the final packing by the distributor may be accomplished atgreat speed by machine or manually, thus promoting economy and eflicienthandling of merchandise.

More specifically, and in accordance with the preferred form, theinvention resides in an integral, intermediate section which connectsthe inner and outer boxes rigidly but without placing strain upon thegluing or adhesive area. This is accomplished by a score line or lineson the connecting section near the adhesive area thereon.

The invention is described in detail with reference to the accompanyingdrawing in which:

Figure 1 is a plan view of the completed sheet or blank showing theouter face;

Figure 2 is a perspective view of the box, with its bottom end open,formed by folding the blank in Figure 1, there being a side portion cutaway to show the integral connecting section;

Figure 3 is a sectional view taken through the box completed, folded andclosed in an upright position with sections l4 and 28 removed, and tFigure 4 is a transverse sectional view taken along the line AA ofFigure 2, showing particularly the integral connecting section.

As shown in Figure 1, the container is formed from a single sheet orblank of flexible material (e. g. paper stock or cardboard) dividedgenerally into two main portions B and C, designating, respectively, theinner and outer boxes or receptacles which comprise inner and outersleeve portions respectively.

Portion B, basically, is rectangular and subdivided by four parallelsections In, I2, l4 and I6 by score or folding lines I 8, 20, 22 and 24.The sections I 0, l2, I4 and I6 thus form the outside walls of the innerbox or sleeve.

Portion C, similarly, comprises four parallel sections 26, 28, 3B and32, divided by the fold lines 34, 36, 38 and 40. These latter sectionsform the outer box or sleeve. In addition, portion C is provided withflaps 42, 44, 46, 48, and 52 which act as top and bottom closures forthe completed carton. Portion. B also has a flap 56 which forms thebottom member of the inner box and acts as additional protection for thecontents. A plurality of spacing tongues or lugs 58 are cut from theportion B and are arranged at spaced intervals in staggered relationwith each other upon opposite sides of the fold lines 18, 2|, 22 and 24and on the free or outer edge of section II] at 58'.

An important section 60 of the blank connects portions B and C and isthe keystone to the construction of the carton. The shaded area 62 ofsection 60 represents a coating of adhesive against which the marginalportion of the inner face of section 32 is pressed thus binding the twoboxes firmly together. In this preferred form, a single score line 64extends along the innermost edge of the adhesive area and thus permitsthe nonadhesive portion of section 60 to be bent slightly withoutplacing undue strain on the binding adhesive. Particular attention isdirected tothe tion C is folded or wrapped around the inner box and isspaced therefrom by the tongues 58. As

previously mentioned, a suitable adhesive is applied to the area 62 andisengaged by the inner face of section 32. As the final folding iscompleted, tension is placed on the'adhesive'area andv section 60 bendsalong line 64 thereby producing an accurate rectangular. carton heldfirmly together Without undue stress or strain. A clear representationof. the completed box is best shown by reference to the enlarged view ofFigure 4.

Assembly of the carton by machine is somewhat different from the basicfolding described above. Usually; standard machinery for folding thisrectangular carton'folds the blank four'times, that is,'.along the lines20, 24; 36 and 40; This type of folding-produces a flattened box forconvenient shipment bythe manufacturer to the packer. The remainingfolding necessary for completing the box vform is done by pressureagainst the outer edges-of thefiattened box whereby the inner and outerboxes are snapped into placein one operation. Specific details of thevarious methods of folding and of the numerous box sizes and shapespossible is not included in this description because of modificationsobvious to one skilled in the-art; The folding of the tabs or flaps 42,44, 4'63"4'8I50, 52 'and 56' to form top and bottom closures is alsoobvious and subject to variations of size and-location The cartonillustrated herein, for example, is adapted particularly for glassbottles where the bottle cap itself is sufficient top protection and theflap 56 is adequate bottom reinforcement.

Reference'is made further to Figure 4 for a better understanding of theessential features of this invention. The connecting section 60 isclearly shown in final position and bent along score line 64 near theadhesive area 62 so that uniform spacing by the tongues 58 is maintainedaround the inner box. Tongues or tabs 58' on the free end of section lieadjacent the tongues 58 on section 60.

The present disclosure is for the purpose of iilustration only andsizes, proportions and specific arrangements of the various parts may bemade without departing from the spirit of the invention;

Having thus described my invention, I claim:

1. A duplex box formed of a single blank, comprising a plurality ofaligned successive sections folded around each other along parallelmarginal lines in one direction only and formin an inner sleeve portionand an outer sleeve portion spaced from and surrounding the same, theinner sleeve portion including four successive sections forming arectangular structure, the outer sleeve portion including foursuccessive sections forming a rectangular structure, and a fifthconnecting section joining said inner and outer sleeve portionsconnected to the fourth section of the inner sleeve portion along amarginal fold line and having a fold line atthe juncture of said fifthconnectin section and the first section of the outer sleeve;

said fifth connecting section having a score line extending throughoutthe length thereof intermediate of and parallel to the parallel marginalfold lines of the fifth connecting section thereby dividing said fifthconnecting section into a first portion lying intermediate the fold lineconnecting it to the fourth section and said score line and a secondportion intermediate the other marginal fold line and said score line,said first portion of the fifth connecting section extending from themarginal fold line connecting said fourth and fifth sections at adiverging acute angle to the first section of said sections comprisingsaid inner sleeve portion, the terminal section of said outersleeveportion overlying said second portion of said fifth connecting sectionand bein engaged therewith, whereby said angular divergent position ofsaid first portion of said fifth connecting section permits said lastnamed portion to extend diagonally between said spaced inner and outersleeves to impart stability to said box and said score line in the fifthconnecting section relieves undue strain on the engagement between saidterminal section and said second portion of the fifth connectingsection, said fourth section of the'inne'r sleeve and the first portionof the fifth connecting section at their common fold line having cutsformed therein along opposite sides of said last named fold line toprovide oppositely extending tongues of length corresponding to thedistance between the inner and outer sleeves and said first section ofthe inner sleeve having similar tongues projecting from its terminalelongated edge adapted to project through said cuts in the fourthsection of the inner sleeve and lie adjacent said tongues on said firstportion of said fifth connecting section 2. A duplex box formed of asingle blank, com: prising a plurality of aligned successive sectionsfolded around each other along parallel marginal lines in one directiononly and forming an inner sleeve portion and an outer sleeve portionspaced from and surrounding the same, the inner sleeve portion includingfour successive sections forming a rectangular structure, the outersleeve portion including four successive sections forminga rectangularstructure, and a fifth connecting section joining said inner and outersleeve portions connected to the fourth section of the inner sleeveportion along a marginal fold line and having a fold line at thejuncture of said fifth connecting section and the first section of theouter sleeve, said fifth connecting section having a score lineextending throughout the length thereof intermediate of and parallel tothe parallel marginal fold lines of the fifth connecting section therebydividing said fifth connecting section into a first portion lyingintermediate the fold line connecting it to the fourth section and saidscore line and a second portion intermediate the other marginal foldlineandsaid score line, said first portion of the fifth connectingsection extending from the marginal fold line connecting said fourth andfifth sections at a diverging acute angle to the first section of saidsections comprising said inner sleeve portion, the "terminal section ofsaid-outer sleeve portion overlying said second portion of said fifthconnecting section and being engaged therewith, whereby said angulardivergent position of said firstportion of said fifth connecting sectionpermits said last named portion to extend diagonally between said spacedinner and outer sleeves to impart stability to said box and saidscoreline inthe fifth connecting section relieves undue strain on theengagement between said terminal section and said second portion of thefifth connecting section, the first section of the inner sleeve havingtongues projecting from its terminal edge to lie in the plane of saidfirst section and each of the four sections of the inner sleeve havingtongues extending from the marginal fold lines thereof to form four setsof tongues to serve as spacers at each of the four corners of the innersleeve. said four sets of tongues being formed by making cuts alongopposite sides of the marginal fold lines to'provide oppositelyextending tongues of length corresponding to the distance between theinner and outer sleeves, said first named tongues extending through cutsin the fourth section and lying adjacent the tongues on said firstportion of said fifth connecting section.

LINUS J. MCDONOUGH.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

